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Old 08-25-2019, 04:34 PM   #1
subaru2015sti
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Default Need advice, Do I need a complete new fuel system if I want to run Tomei UEH?

So I've had my 2015 sti for a little over 2 years bare bone stock since, recently I have decided to add more rumble to it, I plan on getting a catted DP, catback exhaust, but I also want to get UEH(Tomei) and of course get it tuned. Someone told me that if i want to run headers i need a new fuel system (fuel pump, FPR, fuel rails, and fuel injectors). Is this true? if not what mods do i need to run the Tomei headers?
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Old 08-25-2019, 05:10 PM   #2
ifearnoevo
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Originally Posted by subaru2015sti View Post
So I've had my 2015 sti for a little over 2 years bare bone stock since, recently I have decided to add more rumble to it, I plan on getting a catted DP, catback exhaust, but I also want to get UEH(Tomei) and of course get it tuned. Someone told me that if i want to run headers i need a new fuel system (fuel pump, FPR, fuel rails, and fuel injectors). Is this true? if not what mods do i need to run the Tomei headers?
No extra fuel needed for the header with those mods. However if you plan to add an intake with it is when you start to max out the stock fuel system. At least this is what my tuner tells me.
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Old 08-26-2019, 10:47 AM   #3
WRXnick16
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2019 STI CWP

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Those mods won't technically require fuel system upgrades. But it certainly won't hurt if you plan to push the car further in the future.

Personally, I'd rather invest in an ELH or keep the stock header. You probably won't see significant enough gains with an aftermarket unequal length header to justify the cost & install time (at your power level). You'll have plenty of rumble with the stock header mated to the new downpipe & catback.

The ELH is more efficient (balances backpressure & improves volumetric efficiency), produces more 'top-end' power, and can even be considered a 'reliability mod' (reduces cylinder temperature variations between the individual cylinders in hopes of preventing ringland failure).

I think you may be better off investing in a flex fuel kit & fuel system upgrades if you want to keep the rumble and E85 is available where you live.
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Old 08-26-2019, 10:48 PM   #4
subaru2015sti
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thanks guys, I now have a clear idea how to do this. I got the UEL Headers already i bought them impulsively on rallysport since they were on sale
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Old 08-27-2019, 10:23 AM   #5
rtv900
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Originally Posted by ifearnoevo View Post
However if you plan to add an intake with it is when you start to max out the stock fuel system. At least this is what my tuner tells me.
^this hurt my brain to read

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Originally Posted by subaru2015sti View Post
thanks guys, I now have a clear idea how to do this. I got the UEL Headers already i bought them impulsively on rallysport since they were on sale
at least you admitted the impulse buy considering the STI came with UEL headers from the factory, but if you wanted a new set go for it.
Nothing you listed requires more fuel in any way, all of those mods are 'flow' mods that will free up power by letting your motor pump air better, period.
Increasing boost or going to higher ethanol than E10 or significantly increasing peak rpm is what requires more fuel.
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